This is done by using Ayu (Sweetfish) if you are lucky enough to live near a store that sells it. If not, trout can easily be used, it's what I use. Make sure you get one with the head still intact, or else it won't turn out right. The cheek meat is delicious once it gets done. Also a good recipe because it doesn't require many ingredients. The time listed is just an estimate. It is up to your grill or broiler. Iron Chef Morimoto remade this traditional dish on the Ayu battle.